One of the advantages of a heat pump that uses CO2 as the refrigerant (R744) is that it delivers a high water temperature, so there is no need to replace the existing radiators. In addition, this refrigerant is non-toxic, non-flammable, not to mention the extremely low GWP value of (obviously) exactly one. Here we are looking at four CO2 heat pumps.
Renova
Renova's CO2 air/water heat pump has a high CV supply temperature of 85 degrees Celsius, so existing high temperature radiators certainly do not need to be replaced. The capacity of the heat pump is 4.5 or 8 kW, and it can be combined with a 270-liter or 440-liter PCM buffer tank. This vessel can be maintained at a constant temperature of 85 degrees, while the return temperature is at 30 degrees.
Thanks to a thermostatic mixing valve, the desired tap water temperature can be set according to taste. The heat pump operates up to a minimum temperature of -25 degrees and that may reach a maximum of +43 degrees Celsius. For additional heating under extreme conditions and in exceptional situations, an optional electric heating element can always be mounted in the buffer tank.
This buffer vessel uses phase change materials, known as Phase Change Materials (PCM). This material can store an enormous amount of thermal energy within a comparatively small volume and, of course, release it later. This allows the system to handle peak demands without the need to install an additional heavy heat pump.
Look here for more information on the Renova 8kW and 4.5 kW CO2 heat pumps and the 270 liter and 440 liter PCM buffer vessels
MHI Q-ton
This is a heat pump that can produce enormous volumes of hot tap water and is intended for hotels, healthcare facilities, swimming pools, healthcare facilities apartment complexes, housing blocks, laundries and, of course, industry, among others.
This CO2 air/water heat pump from Mitsubishi Heavy Industries delivers a water temperature as high as 90 raden Celsius and manages to do so at outdoor temperatures ranging from -25 to +43 degrees. Where up to -7 degrees, one hundred percent of capacity is maintained. The Q-ton is completely modular and can consist of up to 16 units. This allows the capacity to increase incrementally from 30 kW to a maximum of 480 kW (30 kW per unit).
The entire system can be operated remotely via a single controller with touchscreen. Every day it can provide between 3,000 and about 100,000 liters of hot tap water with an adjustable temperature of 60 to 90 degrees.
Look here for more information about the Mitsubishi Heavy Industries Q-ton
Durocan
In Durocan's (All Electric Ready) hybrid and all-electric CO2 heat pumps, the outdoor unit has a thermal output of 4.5 kW. Through a cascade arrangement of up to three of these outdoor units, a total output of 4.5 kW, 9 kW, or 13.5 kW can be selected depending on the need. The outdoor unit can be connected to a regular 230 Volt power supply as long as it is one or two units. Only with three outdoor units will power supply be required.
Up to an outside temperature of -31 degrees Celsius, heating water of 63 degrees and domestic hot water of 65 degrees Celsius can be produced. At 37 dB(A), the outdoor unit is even quieter than a typical refrigerator. In the case of two units it becomes 40 db(A) and in the case of three outdoor units 41 dB(A), so the sound in those cases is still only at refrigerator level.
Parameters and system temperatures can be accessed via the Internet in addition to the display. Convenient for both the user and the installer, as the system can thus be managed remotely. Depending on hot water requirements, a 200-liter or 300-liter boiler can be chosen to complete the all-electric CO2 heat pump.
Look here for more information about Durocan heat pump systems
Interclima Greentech GeoHeat
This is a water-to-water heat pump for providing domestic hot water and is specifically designed for commercial and industrial applications. Think restaurants, hotels, laundries, residential complexes, hospitals, sports complexes and so on.
The GeoHeat can produce hot tap water up to ninety degrees Celsius and the operating range of the heat pump is between -3 degrees Celsius and +20 degrees Celsius. From well water, that is, because unlike the other heat pumps discussed this time it is a water-to-water heat pump.
There are four possible models, the GeoHeat 18, 24, 48 and 100. Because these models can be interconnected, also in different construction sizes, almost any desired capacity is possible. In total, this can produce about 3,000 to 15,000 liters of hot tap water daily. In addition, this heat pump can also recover cold which can then be used for cooling purposes (tap water of +6 degrees Celsius), instead of returning this cold to the source. This provides additional energy savings.
Prefer an air-to-air heat pump from Interclima Greentech? Then you end up with the AirHeat that has an operating range between -20 degrees and +40 degrees Celsius (outside temperature).
Look here for more information about the Interclima Greentech Geheat
